CTSP Struck-By and Falling Object Hazards Flashcards

According to ANSI Z133, what is the minimum safe distance bystanders must maintain from tree removal operations?

Answer: Twice the height of the tree being removed

ANSI Z133 requires bystanders to stay at a distance of at least twice the height of the tree to account for the possibility of unexpected total tree failure.

What is the primary purpose of establishing a drop zone during tree removal operations?

Answer: To designate where cut pieces will fall and keep non-essential personnel clear

A drop zone designates the landing area for cut pieces and must be kept clear of all non-essential personnel to prevent struck-by injuries.

What should ground workers do while a climber is making overhead cuts?

Answer: Position themselves in a safe zone outside the established drop zone

Ground workers must position themselves outside the drop zone and never stand below a climber who is actively making cuts.

What is a 'barber chair' in tree felling, and why is it considered extremely dangerous?

Answer: When a tree splits vertically during felling, causing the butt to kick back violently

A barber chair is a vertical split that occurs before the felling cut is complete, causing the trunk butt to kick back violently and the crown to fall unpredictably.

What type of PPE is specifically designed to protect tree workers against chainsaw contact, including kickback?

Answer: Chainsaw-resistant chaps or pants containing cut-resistant fiber material

Chainsaw chaps or cut-resistant pants contain fibrous material that jams the saw chain upon contact, stopping the chain before it penetrates deeply.

What is the recommended escape route plan a feller must establish before beginning a felling operation?

Answer: Two escape routes at approximately 45-degree angles from the back of the tree

Two escape routes positioned at 45-degree angles from the back of the tree allow the feller to quickly move away from the falling tree and the kickback zone.